| |
| /* ----------------------------------------------------------------------------------------------------------- |
| Software License for The Fraunhofer FDK AAC Codec Library for Android |
| |
| © Copyright 1995 - 2012 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. |
| All rights reserved. |
| |
| 1. INTRODUCTION |
| The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements |
| the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio. |
| This FDK AAC Codec software is intended to be used on a wide variety of Android devices. |
| |
| AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual |
| audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by |
| independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part |
| of the MPEG specifications. |
| |
| Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer) |
| may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners |
| individually for the purpose of encoding or decoding bit streams in products that are compliant with |
| the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license |
| these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec |
| software may already be covered under those patent licenses when it is used for those licensed purposes only. |
| |
| Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality, |
| are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional |
| applications information and documentation. |
| |
| 2. COPYRIGHT LICENSE |
| |
| Redistribution and use in source and binary forms, with or without modification, are permitted without |
| payment of copyright license fees provided that you satisfy the following conditions: |
| |
| You must retain the complete text of this software license in redistributions of the FDK AAC Codec or |
| your modifications thereto in source code form. |
| |
| You must retain the complete text of this software license in the documentation and/or other materials |
| provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form. |
| You must make available free of charge copies of the complete source code of the FDK AAC Codec and your |
| modifications thereto to recipients of copies in binary form. |
| |
| The name of Fraunhofer may not be used to endorse or promote products derived from this library without |
| prior written permission. |
| |
| You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec |
| software or your modifications thereto. |
| |
| Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software |
| and the date of any change. For modified versions of the FDK AAC Codec, the term |
| "Fraunhofer FDK AAC Codec Library for Android" must be replaced by the term |
| "Third-Party Modified Version of the Fraunhofer FDK AAC Codec Library for Android." |
| |
| 3. NO PATENT LICENSE |
| |
| NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer, |
| ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with |
| respect to this software. |
| |
| You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized |
| by appropriate patent licenses. |
| |
| 4. DISCLAIMER |
| |
| This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright holders and contributors |
| "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, including but not limited to the implied warranties |
| of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR |
| CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages, |
| including but not limited to procurement of substitute goods or services; loss of use, data, or profits, |
| or business interruption, however caused and on any theory of liability, whether in contract, strict |
| liability, or tort (including negligence), arising in any way out of the use of this software, even if |
| advised of the possibility of such damage. |
| |
| 5. CONTACT INFORMATION |
| |
| Fraunhofer Institute for Integrated Circuits IIS |
| Attention: Audio and Multimedia Departments - FDK AAC LL |
| Am Wolfsmantel 33 |
| 91058 Erlangen, Germany |
| |
| www.iis.fraunhofer.de/amm |
| amm-info@iis.fraunhofer.de |
| ----------------------------------------------------------------------------------------------------------- */ |
| |
| /******************************** MPEG Audio Encoder ************************** |
| |
| author: M. Werner |
| contents/description: Convert chaos measure to the tonality index |
| |
| ******************************************************************************/ |
| |
| #include "tonality.h" |
| #include "chaosmeasure.h" |
| |
| static const FIXP_DBL normlog = (FIXP_DBL)0xd977d949; /*FL2FXCONST_DBL(-0.4342944819f * FDKlog(2.0)/FDKlog(2.7182818)); */ |
| |
| static void FDKaacEnc_CalcSfbTonality(FIXP_DBL *RESTRICT spectrum, |
| INT *RESTRICT sfbMaxScaleSpec, |
| FIXP_DBL *RESTRICT chaosMeasure, |
| FIXP_SGL *RESTRICT sfbTonality, |
| INT sfbCnt, |
| const INT *RESTRICT sfbOffset, |
| FIXP_DBL *RESTRICT sfbEnergyLD64 ); |
| |
| |
| void FDKaacEnc_CalculateFullTonality(FIXP_DBL *RESTRICT spectrum, |
| INT *RESTRICT sfbMaxScaleSpec, |
| FIXP_DBL *RESTRICT sfbEnergyLD64, |
| FIXP_SGL *RESTRICT sfbTonality, |
| INT sfbCnt, |
| const INT *sfbOffset, |
| INT usePns) |
| { |
| INT j; |
| #if defined(ARCH_PREFER_MULT_32x16) |
| FIXP_SGL alpha_0 = FL2FXCONST_SGL(0.25f); /* used in smooth ChaosMeasure */ |
| FIXP_SGL alpha_1 = FL2FXCONST_SGL(1.0f-0.25f); /* used in smooth ChaosMeasure */ |
| #else |
| FIXP_DBL alpha_0 = FL2FXCONST_DBL(0.25f); /* used in smooth ChaosMeasure */ |
| FIXP_DBL alpha_1 = FL2FXCONST_DBL(1.0f-0.25f); /* used in smooth ChaosMeasure */ |
| #endif |
| INT numberOfLines = sfbOffset[sfbCnt]; |
| |
| if (!usePns) |
| return; |
| |
| C_ALLOC_SCRATCH_START(chaosMeasurePerLine, FIXP_DBL, (1024)); |
| /* calculate chaos measure */ |
| FDKaacEnc_CalculateChaosMeasure(spectrum, |
| numberOfLines, |
| chaosMeasurePerLine); |
| |
| /* smooth ChaosMeasure */ |
| for (j=1;j<numberOfLines;j++) { |
| FIXP_DBL tmp = fMultDiv2(alpha_1, chaosMeasurePerLine[j]); |
| chaosMeasurePerLine[j] = fMultAdd(tmp, alpha_0, chaosMeasurePerLine[j-1]); |
| } |
| |
| FDKaacEnc_CalcSfbTonality(spectrum, |
| sfbMaxScaleSpec, |
| chaosMeasurePerLine, |
| sfbTonality, |
| sfbCnt, |
| sfbOffset, |
| sfbEnergyLD64); |
| |
| C_ALLOC_SCRATCH_END(chaosMeasurePerLine, FIXP_DBL, (1024)); |
| } |
| |
| |
| /***************************************************************************** |
| |
| functionname: CalculateTonalityIndex |
| description: computes tonality values out of unpredictability values |
| limits range and computes log() |
| returns: |
| input: ptr to energies, ptr to chaos measure values, |
| number of sfb |
| output: sfb wise tonality values |
| |
| *****************************************************************************/ |
| static void FDKaacEnc_CalcSfbTonality(FIXP_DBL *RESTRICT spectrum, |
| INT *RESTRICT sfbMaxScaleSpec, |
| FIXP_DBL *RESTRICT chaosMeasure, |
| FIXP_SGL *RESTRICT sfbTonality, |
| INT sfbCnt, |
| const INT *RESTRICT sfbOffset, |
| FIXP_DBL *RESTRICT sfbEnergyLD64 ) |
| { |
| INT i, j; |
| |
| for (i=0; i<sfbCnt; i++) { |
| FIXP_DBL chaosMeasureSfbLD64; |
| INT shiftBits = fixMax(0,sfbMaxScaleSpec[i] - 4); /* max sfbWidth = 96 ; 2^7=128 => 7/2 = 4 (spc*spc) */ |
| |
| FIXP_DBL chaosMeasureSfb = FL2FXCONST_DBL(0.0); |
| |
| /* calc chaosMeasurePerSfb */ |
| for (j=(sfbOffset[i+1]-sfbOffset[i])-1; j>=0; j--) { |
| FIXP_DBL tmp = (*spectrum++)<<shiftBits; |
| FIXP_DBL lineNrg = fMultDiv2(tmp, tmp); |
| chaosMeasureSfb = fMultAddDiv2(chaosMeasureSfb, lineNrg, *chaosMeasure++); |
| } |
| |
| /* calc tonalityPerSfb */ |
| if (chaosMeasureSfb != FL2FXCONST_DBL(0.0)) |
| { |
| /* add ld(convtone)/64 and 2/64 bec.fMultDiv2 */ |
| chaosMeasureSfbLD64 = CalcLdData((chaosMeasureSfb)) - sfbEnergyLD64[i]; |
| chaosMeasureSfbLD64 += FL2FXCONST_DBL(3.0f/64) - ((FIXP_DBL)(shiftBits)<<(DFRACT_BITS-6)); |
| |
| if (chaosMeasureSfbLD64 > FL2FXCONST_DBL(-0.0519051) ) /* > ld(0.05)+ld(2) */ |
| { |
| if (chaosMeasureSfbLD64 <= FL2FXCONST_DBL(0.0) ) |
| sfbTonality[i] = FX_DBL2FX_SGL(fMultDiv2( chaosMeasureSfbLD64 , normlog ) << 7); |
| else |
| sfbTonality[i] = FL2FXCONST_SGL(0.0); |
| } |
| else |
| sfbTonality[i] = (FIXP_SGL)MAXVAL_SGL; |
| } |
| else |
| sfbTonality[i] = (FIXP_SGL)MAXVAL_SGL; |
| } |
| } |
